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The rock in the image is marble, which has many layers and is extremely hard. It was formed under high heat and pressure. Marble is an
example of
rock changing into
rock.
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in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

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14,16 18 reacts with group